Hoverfly is a lightweight, open source API simulation tool.

Using Hoverfly, you can create realistic simulations of the APIs your
application depends on.

 * Replace slow, flaky API dependencies with realistic, re-usable simulations
 * Simulate network latency, random failures or rate limits to test edge-cases
 * Extend and customize with any programming language
 * Export, share, edit and import API simulations
 * CLI and native language bindings for Java
 * REST API
 * Lightweight, high-performance, run anywhere
 * Apache 2 license
